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Originally Posted by Alan Anderson
We did a lot of experimenting last year with using an optical mouse for position tracking. Mark Koors came up with the right lens for making it into a "telephoto" system, Wildstang's programmers contributed code for communicating directly with a specific mouse chip, and we had travel and turn sensing working okay as long as the height of the mouse above the carpet did not vary. However, as little as a millimeter of height change gave a significant difference in detected travel. I finally decided that it wasn't going to be possible to get consistent data from the scheme if the mouse wasn't physically in contact with the carpet.
Our robot last year used a trio of miniature "follower" omniwheels with encoders to give us feedback on forward/backward travel, sideways travel, and turn angle.
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I found a guide by a person who used the parts from a mouse to create a successful odometer for his robot. The robot is small and slow so it might have the same distancing problems and/or speed issues and they just aren't as noticeable for his application. I highly recommend taking a look at it.
http://home.comcast.net/~maccody/rob...1/croms-1.html I'm really impressed with his results.